Pitman



Dec. 7 ,-1926. I 1,609,845.

. A. THOMSON ET AL PITMAN Filed August 5. 1932 2 Sheets-Sheet 1 654 H BY W h. 714%.

/ ATTORNE S Dec. 7 1926.

A. THOMSON El Al,

PITMAN File August '5. 1922 2 Sheets-Sheet 2 ATTORNEYfif Dec. 7, 19

EJETED STATES OFFICE.

ALEXANDER THOMSON, on SOUBLA Ann-Joint HSKI'LL or nousr'o'n, terms, As-

SIGKOBS or 'rwo-rIF'rHs To SAID EILL AND'THREE-TIF'THS To B. BROOKS, an. or HOUSTON, TEXAS.

Application filed August 3,1922.

This invention relates to new PITMAN.

and useful improvements in a pitman.

One object of the invention is to provide a pit-man ofthe character described specially designed for use in'oper ating oil pumps used inpumpingthe fluid from an oil well.

Another -ob ect of the 111V811t10111S't0 pro videa pitman of the having a specially.

character described designed bearing to receive the WIlSt pm ofthe crank arm through which the walking beam,

is oscillated.

p ump,

which operates the much more durable man now in common use, more easily connected up for disconnected than the man.

than the ordinary pitand which may be operation and present type of pit- In pumping an oil well a walking beam is employed which is connected to the power through the pitman, he often connected the crank applied.

been specially and the pitman must to and disconnected from arm through which the power is The pitman herein described has designed so that itmay be readily connected and disconnected.

A further feature-of the invention resides inthe provision of a pitman of the character described which maybe readily taken up or adjusted so as to take -bearing and form a close fit on of the'cran'k arm. A still further up the wear of the the wrist pin feature of the invention resides in the provision of suitable means for lubricating the bearing.

l i' ith the above and other objects in view the invention has particular relation to certain novel features of tion and arrangement of parts,

construction, operaan example of which is given in this specification and illustrated 1n the accompanying drawings,

Figure 1 is a side view of a pitman connection constructed 1n accordance with this invention.

Figure sectional connection with the Figure 3' is an edge view man members;

of one ofthe pit- 4 is a plan. view thereof end of the walking meral 5 designates in any conventional manner shown, and" I Serial No! 5795431;

One endoflthis walkinggbeam is connected to the pump rod' 4:" and operatesto reciprocate said rod in pumping, the well; This beam however may be connected'to the'cable and usedin cable tool drilling. The pitman connected to the other end of the walking-beam. The nuthe power wheel, which is fixed to the shaft 6 and whichis driven in any convent1onal manner. To one end of the shaft 6 there is fired a crank arm 7 whose outer endis'formed'with a wrist p1n8.

v The ,pitman includes aba'r 9, preferably formed of metal and whichmay be connected to the walking beam through a suitable arm 10 formed of wood or met-ah, and bolted to the barf), as shownfin Figure-2; and pivoted to said walking The ba r is channel shaped, as at'its free end is formed with a transverse side slot 11', forming a transverse shoulder whose inner end is formed with a half-bearing member 12 which is preferably linedwithbabbitt or other soft metal 13, and opposite the slot .11- the bar 9 is formed with the hand grip 14. The numeral 15 designates a removableplate havmg the half-bearing. 16,; projecting from its inner face and prererabr lined with babbitt or other soft" metal 17/ t The bearing member is shown assembled with the 'bar 9 in dotted lines in Figure i and when so assem led wilf form a complete bearing in which the .wrist pin 8 works.- i

beam.

H The' bar '9 andbearing member 15 are of sufficient thicknessto give an adequate bearing surface for the wrist'pin 8, as illustrated in Figure 21 A clamp block 18 is fitted in a transverse groove 19 in the bearing member 15, and the block 18 and bearing member 15 have aligned key ways 20 and 21 provided to receive the slot between said shoulder and wedge shaped key which is fitted through aligned keyways 23 and 24 in the flanges oi the bar 9. A cap screw 25 is fitted through a suitable opening in the end flange 26 of the bearing member 15 and is threaded through the clamp block 18. By tightening up on this cap screw the block 18 is clamped against the key 22 and the key held against detachment and forms an abutment for the bearing member 15 and said bearing is thus securely held in place. As the wrist pin bearing becomes worn the key 22 may be driven further in and the wear thus taken up.

As before stated it often becomes necessary to detach the pitman from the wrist pin. In order to accomplish this the set screw 25 is loosened. and the key 22 removed. The bearing member 15 may then be easily lifted out of place, a hand gr'p 27 being formed on it for this purpose. The pitman may then be readily lifted off of the wrist pin by means of the hand grip 14, said wrist pin passing out through the slot 11.

lnorder to lubricate the bearing an oil reservoir 28 is provided in the bearing member 15 and when filled with oil the lubricant will reach the bearing through the port 29 in the upper half of the bearing, as illustrated in Figure 8.

W hat we claim is 1. A pitman formed with two bearing members, which, when assembled, form a bearing, a removable key passing through a key way in said members and securing them together, a clamp block formed with a keyway through which the key passes and means for locking said block in frictional engagement with the key.

2. A pitman bearing formed with two bearing members, one of which has a side slot at substantially a right angle to the bearing aiis, one side of the slot forming a transverse shoulder, a removable abutment disposed transversely with respect to said axis, and the other of which fits between said shoulder and abutment and interlocks with the latter and closes said slot when the members are in assembled position.

A pitman having a wrist pin bearing formed with two bearing members, one of which is formed with a fixed transverse end shoulder, a movable abutment carried by said member and disposed transversely of said bearing, said pitman having a side ab ut-ment the other bearing member fitting into said slot and between said shoulder and abutment when the members are assembled together, said slot being adapted to permit the lateral movement of the wrist pin into or out of the bearing.

4. A pitman formed with two members, one formed with a transverse end shoulder having a wrist pin bearing, a removable member which has a neoeisas abutment arranged substantially parallel with the shouloer and carried by said memb r, the saio member of said pitman having a side slot between said shoulder and abutment, the other member being fitted into said slot between said shoulder and abutment and being secured in position by said abutment, and having an end plate abutting the member first named, said side slot being cut through the side of the pitman to permit the movement of the wrist pin therethrough, a line at right angles to the axis of the bearing.

A pitman having a transverse shoulder at its outer end forming a fixed bearing member, a removable abutment carried by the pitman and arranged substantially parallel with, and spaced from said shoulder, said pitman having a side slot between said bearing member and abutment, a removable bearing member fitted between said shoulder and abutment and held in place by said abutment, an end plate carried by said removable member and abutting the fixed member, said bearing members, when assembled, forming a complete bearing, said slot being disposed to permit the movement of the removable bearing into place on a line parallel with the bearing axis. I

6. A pitman having a transverse shoulder, forming a fixed bearing member at its outer end, a removable key. carried by the pitman and arranged substantially parallel with and spaced from the shoulder, a removable bearing member fitted between said shoulder and key and held in position by said key and formed with an end plate which abuts the fixed member, said bearing memhere, when assemblechforming a complete caring, said shoulder and key being disposed to permit the insertion or removal of the removable bearing member on a line parallel with the bearing axis.

7. A pitman having a transverse shoulder, forming a fixed bearin' member at its outer end, a removable key carried by the p1tman and arranged transversely with respect to, and spaced from the shoulder, said pitman having a side slot between the shoulder and key, a removable bearing member fitted between said shoulder and key and movable into and out of position on a line parallel with respect to the bearing axis and being held in position by said key, said bearing members, when assembled forming a complete bearing and means for securing said key in the pitman. V

8. A pitman bearing formed of a bearing side slot at substan tially right angles to the bearing axis forming a. transverse shoulder provided with a halt bearing, a removable abutment carried by said member, a plate which is adapted to fit against the side of said member, a lateral projection carried by the inner of said plate which projects through slot and rests against said abutment formed with a half bearing, said bearings, when so assembled, forming a complete bearing.

9. A pitman bearing formed with two bearing members, one of which has a side slot forming an end shoulder which has a halt bearing, the other member including an end plate adapted to fit against the first mentioned member and a projection formed integrally with said plate and adapted to fit through said slot and formed with a half bearing, said half bearings, when assembled, forming a complete bearing and a 15 removable key extending through said first mentioned member and disposed transversely with respect to said bearing axis and between which and said shoulder said projection is disposed, said key forming means 20 for securing said members in assembled relation.

In testimony whereof we have signed our names to this specification.

ALEXANDER THOMSON. JOHN H. HILL. 

